Members of the Mounted Patrol Unit of the San Francisco Police Department (SFPD ) stand in front a fence surrounding the world-famous touristic Pier 39 and Fisherman's Wharf in San Francisco, CA, on March 17, 2020.

Millions of San Francisco Bay Area residents were ordered to stay home to slow the spread of the coronavirus as part of a lockdown effort, marking one of the nation's strongest efforts to stem the spread of the deadly virus.